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Model
MDS-JE780
Pages
68
Size
2.96 MB
Type
PDF
Document
Service Manual
Brand
Device
Audio
File
mds-je780.pdf
Date

Sony MDS-JE780 Service Manual ▷ View online

8
MDS-JE780
CHECKS PRIOR TO PARTS REPLACEMENT AND ADJUSTMENTS
Before performing repairs, perform the following checks to determine the faulty locations up to a certain extent.
Details of the procedures are described in “5 Electrical Adjustments”.
• 5-6-2. Laser power check (see page 26)
• 5-6-3. Iop Compare (see page 26)
• 5-6-4. Auto Check (see page 27)
Note:
The criteria for determination above is intended merely to determine if satisfactory or not, and does not serve as the specified value for
adjustments.
When performing adjustments, use the specified values for adjustments.
FORCED RESET
The system microprocessor can be reset in the following procedure.
Use these procedure when the unit cannot be operated normally due to the overrunning of the microprocessor, etc.
Procedure :
Remove the short-pin attached to CN404, and then attach it again.
[MAIN BOARD] (Component Side)
CN404
In replacing the BD board or MD mechanism deck, perform the
work through the steps provided below:
1. Remove the IC195 from the BD board to be replaced.
2. Remove the IC195 from new BD board.
3. Mount the IC195 on new BD board, which was removed from
the BD board to be replaced.
4. Install new BD board in the set.
Note:
 The IC195 cannot be replaced with a new part.
– BD BOARD 
(Conductor Side)
 –
OPERATION CHECK IN NORMAL MODE
Aiso in checking the recording and other functions, connect the
set to the PC with a USB cable and perform the operation on the
application software “OpenMG Jukebox” attached.
CN103
CN102
IC195
1
41
58
1
27
23
NOTES ON REPLACING BD BOARD OR MD MECHANISM DECK
9
MDS-JE780
Fig. 2 Reading the Test Mode Display
(During playback)
@@###**$$
Fluorescent display tube display
@@ : Parts No. (name of area named on TOC)
### : Cluster
**
: Sector
$$
: Track mode (Track information such as copyright infor-
mation of each part)
RETRY CAUSE DISPLAY MODE
• In this test mode, the causes for retry of the unit during recording can be displayed on the fluorescent indicator tube. During playback, the
“track mode” for obtaining track information will be set.
This is useful for locating the faulty part of the unit.
• The following will be displayed :
During recording and stop : Retry cause, number of retries, and number of retry errors.
During playback
: Information such as type of disc played, part played, copyright.
These are displayed in hexadecimal.
Procedure:
1. Insert the recordable disc.
2. Press  MENU/NO  button to display “Edit Menu” on the fluorescent display.
3. Turn  l AMS L  knob to display “All Erase?” on the fluorescent display.
4. Press  YES  button or  l AMS L  knob to display “All Erase??” on the fluorescent display.
5. Press  YES  button, “Complete!” is displayed on the fluorescent display and it turns off immediately.
6. Procedure 1: Press the  x  button continuously for about 10 seconds.
Procedure 2: Press the  LEVEL/DISPLAY/CHAR  button while pressing the  x  button and  MENU/NO  button.
7. When the mode is set, “RTs 00c 00e 000” is displayed.
8. Press the  z REC  button to start recording. Then press the  X  button and start recording.
9. To check the “track mode”, press the  H  button to start play.
10.To exit the test mode, press the  @/1  button, and turn OFF the power. When “TOC” disappears, disconnect the power plug from the outlet.
If the test mode cannot be exited, refer to “Forced Reset” on page 8.
} Address (Physical address on disc)
Hexadecimal
Bit
Binary
Higher Bits
Lower Bits
8
4
2
1
8
4
2
1
b7 b6 b5 b4 b3 b2 b1 b0
0
0
0
0
0
0
0
1
0
0
0
0
0
0
1
0
0
0
0
0
0
1
0
0
0
0
0
0
1
0
0
0
0
0
0
1
0
0
0
0
0
0
1
0
0
0
0
0
0
1
0
0
0
0
0
0
1
0
0
0
0
0
0
0
When track jump (shock) is detected
When ADER was counted more than five times continu-
ously
When ADIP address is not continuous
When DIN unlock is detected
When not in focus
When ABCD signal level exceeds the specified range
When CLV is unlocked
When access operation is not performed normally
Hexa-
decimal
shock
ader5
Discontinuous address
DIN unlock
FCS incorrect
IVR rec error
CLV unlock
Access fault
Cause of Retry
Occurring conditions
01
02
04
08
10
20
40
80
Reading the Retry Cause Display
Fig. 1 Reading the Test Mode Display
(During recording and stop)
RTs@@c##e***
Fluorescent display tube display
@@ : Cause of retry
##
: Number of retries
*** : Number of retry errors
Reading the Display:
Convert the hexadecimal display into binary display.
If more than two causes, they will be added.
Example
When 42 is displayed:
Higher bit : 4 = 0100 
t b6
Lower bit : 2 = 0010 
t b1
In this case, the retry cause is combined of “CLV unlock”
and “ader5”.
When A2 is displayed:
Higher bit : A = 1010 
t b7+b5
Lower bit : 2 = 0010 
t b2
The retry cause in this case is combined of “access fault”,
“IVR rec error”, and “ader5”.
Hexadecimal 
t
 Binary Conversion Table
Hexadecimal
Binary
Hexadecimal
Binary
0
1
2
3
4
5
6
7
8
9
A
B
C
D
E
F
0000
0001
0010
0011
0100
0101
0110
0111
1000
1001
1010
1011
1100
1101
1110
1111
10
MDS-JE780
Hexadecimal
Bit
Binary
Higher Bits
Lower Bits
8
4
2
1
8
4
2
1
b7 b6 b5 b4 b3 b2 b1 b0
0
0
0
0
0
0
0
1
0
0
0
0
0
0
1
0
0
0
0
0
0
1
0
0
0
0
0
0
1
0
0
0
0
0
0
1
0
0
0
0
0
0
1
0
0
0
0
0
0
1
0
0
0
0
0
0
1
0
0
0
0
0
0
0
Hexa-
decimal
Details
01
02
04
08
10
20
40
80
Emphasis OFF
Monaural
This is 2-bit display. Normally 01.
01:Normal audio. Others:Invalid
Audio (Normal)
Original
Copyright
Write prohibited
When 0
When 1
Emphasis ON
Stereo
Invalid
Digital copy
No copyright
Write allowed
Reading the Display:
Convert the hexadecimal display into binary display. If more than two causes, they will be added.
Example When 84 is displayed:
Higher bit : 8 = 1000 
t b7
Lower bit : 4 = 0100 
t b2
In this case, as b2 and b7 are 1 and others are 0, it can be determined that the retry cause is combined of “emphasis OFF”, “monaural”,
“original”, “copyright exists”, and “write allowed”.
Example When 07 is displayed:
Higher bit : 0 = 1000 
t All 0
Lower bit : 7 = 0111 
t b0+b1+b2
In this case, as b0, b1, and b2 are 1 and others are 0, it can be determined that the retry cause is combined of “emphasis ON”, “stereo”,
“original”, “copyright exists”, and “write prohibited”.
Hexadecimal 
t
 Binary Conversion Table
Hexadecimal
Binary
Hexadecimal
Binary
0
1
2
3
4
5
6
7
8
9
A
B
C
D
E
F
0000
0001
0010
0011
0100
0101
0110
0111
1000
1001
1010
1011
1100
1101
1110
1111
Reading the Track Mode Display
11
MDS-JE780
SECTION 2
GENERAL
This section is extracted from
instruction manual.
AMS wj (14) (21) (27) (39) (43)
CLEAR wh (24) (33) (43)
Display window wa
EJECT A 8 (10) (21) (26)
GROUP ON/OFF 3 (11) (23) 
(34)
GROUP SKIP 4 (12) (23) (34)
INPUT ws (10)
KEYBOARD jack qj (43)
LEVEL/DISPLAY/CHAR w; (10) 
(16) (21) (32)
MD insertion slot 6 (10) (20)
MDLP indicator 7 (14) (21)
MENU/NO qs (14) (21) (26) (39) 
(43)
NET MD 5 (9)
PHONE LEVEL qh (21)
PHONES jack qg (17) (21) (40)
PLAY MODE qk (20) (42)
REC MODE wf (13)
REC z wg (10) (14) (17)
Remote sensor 2 (8)
REPEAT ql (20)
STANDBY indicator 1 (10) (20)
TIMER
 
qf (42)
YES qd (14) (25) (27) (39) (43)
 
?/1 1 (10) (20) (26)
H 9 (10) (20) (42) (44)
X 0 (10) (21) (44)
x qa (10) (21) (26) (42) (44)
m/M wd (21) (28) (44)
Main unit
ALPHBAETICAL ORDER
A - M
N - Y
BUTTON DESCRIPTIONS
MENU/
NO
YES
AMS
CLEAR
PUSH ENTER
REC
INPUT
REC MODE
EJECT
STANDBY
TIMER
PHONES
PHONE LEVEL
KEYBOARD
ON/OFF
SKIP
NET MD
PLAY MODE
REPEAT
LEVEL/
DISPLAY/CHAR
MIN
MAX
REC OFF PLAY
MDLP
l
L
m
M
H
X
x
z
A
?/1
GROUP
1
3
4
5
6
7
8
9
0
qa qs
qd
qf
qg
qh
qj qk ql
w;
ws
wa
wd wf wg
wj
wh
2
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